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- The VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedanceA three-phase, 60-Hz, untransposed transmission line runs in parallel with a telephone line for 20 km. The power line carries a balanced three-phase rms current of Ia = 3202 – 240°A. The line configuration is as shown in figure. Assume zero current flows in the ungrounded telephone wires. Find the magnitude of the voltage induced in the telephone line. = 32020°A, Ī, = 3204–120°A, and a 4 m 4 m 5 m d G2 mODevelop a small-scale equivalent transmission line pi model (per phase) of the transmission lines with the specification given in table 1. The conductors are placed with a flat horizontal spacing of 7.25 meters. Consider that the load connected against the line 125MW at 0.85 lagging power factor. You are required to develop an equivalent model for a maximum 220V (RMS) sending and receiving end voltage and a maximum of 5A load current. Sr. NTDC Transmission Line Length Conductor No. Туре 220 kV DG Khan-Loralai Transmission Line (227 km) 227km Pheasant TABLE AJ Electrical characteristics of bare aluminum conductors steel-relnforced (ACSR)+ Reniertance Reactance per conductor 1-ft apacing. 60 Ha Ae, 60 Ha Capaitive Aluminum ares, emil Layers of Outaide aluminum diameter, in a/1,000 ft soC, D/ml GMR Induetive Stranding AL/8t De, 20°C. 20C, a/mi Code word D. t Ma-mi Waswing Partridge Ostrieh Merlin Linnet Oriole Chickndee Ibin Pelienn Flicker Hawk 266,800 206,800 300,000 336, 400 336.400…
- The load flow data for the sample power system are given below. The voltage magnitude at bus 2 is to be maintained at 1.04 p.u.Determine the set of load flow equations at the end of first iteration by using N-R method. Impedance for sample system Bus Code Impedances line charging admittance 1-2 0.08 + j0.24 0.0 1-3 0.02 + j0.06 0.0 2-3 0.06 + j0.18 0.0 Schedule of generation and loads: Bus Code Assured Voltages Generation Load…Quest- A single phase 50 Hz, system supplies an inductive load of 5000 kw at power factor 0.8 lag through a line 25 km. Resistance of the line is 0.0195 2/km and inductance = 0.36 mH/km, receiving end voltage is 10 kV. A capacitor is connected across the load to get the voltage regulation of 10%. Ratio of transmission line loss with and without shunt capacitor isA single phase 50 Hz generator supplies an inductive load of 5,000 kW at a power factor of 0.707 lagging by means of an over head transmission line 20 km long. The line resistance and inductance are 0.0195 ohm and 0.63 mH per km. The voltage at the receiving is required to be kept constant at 10 kV Q1. the sending end voltage and voltage regulation of line Q2. the value of the capacitor to be placed in parallel with the load such that the regulation is requced to 50 % of that obtained in Q1 Q3. compare the transmission efficiency in parts of Q1 & Q2.
- The figure shows a 500-kV (line-to-line voltage) transmission line linking two systems. The theoretical maximum power that can be transferred from System A to System B is 5,000 MW, which occurs when the power angle 8 = 90°. The line current is then proportional to (VA - VB) The reactive power losses (Mvar) in the transmission line during this transfer would be most nearly: Wond O A. 1,667 O B.. 3,333 O C. 5,000 O D. 10,000 Know EQUIVALENT SYSTEM A VA= 500 28 KV m XL = 50 Ω EQUIVALENT SYSTEM B VB = 500 40⁰ kV Oelectrical engineering department plzz solveA three-phase balanced load of 15A per phase is supplied by a steel wire armoured cable with a c.s.a. of 2.5mm². The voltage drop for this cable is 15mv/A/m and the circuit is 40m long. Calculate the voltage drop in the cable.
- 220 kV, 50 Hz, 200 km line has its conductors on the corners of a triangle with sides 6 m. 6 m and 12 m. The conductor radius is 1.81 cm. Find the capacitance per phase per km. [B.T.E. Pb. Elec. Power I December 1995) (Ans. 1.844 F) Into the4. A 4160V, three phase source, 4-wire supplying an unbalanced three phase load. The unbalanced connected load are: Zan = 150/53.13° ; Zbn = 150-53.13° ; Zen = 1500° Assuming positive sequence and the reference is the line voltage "a", determine: a. the line current "a" b. the line current “b” c. the line current "c". d. the total real power e. the total reactive power f. the total apparent power g. the overall power factor. h. the neutral current.The steady-state voltage drop between the load and the sending end of the line seen in (Figure 1) is excessive Suppose that V-4950/0° V (rms). A capacitor is placed in parallel with the 192 kVA load and is adjusted until the steady-state voltage at the sending end of the line has the same magnitude as the voltage at the load end, that is, 4950 V (rms). The 192 kVA load is operating at a power factor of 0.8 lag. Part A Calculate the size of the capacitor in microfarads if the circuit is operating at 60 Hz. In selecting the capacitance, use the value that results in the lowest possible power loss in the line. Express your answer in microfarads to three significant figures. ▸ View Available Hint(s) Figure 1 of 1 202 1100 192 kVA 0.8 lag ΜΕ ΑΣΦ. 11 vec C= 22.8 Submit Previous Answers Incorrect; Try Again; 5 attempts remaining Provide Feedback ? F